JPH05182543A - Manufacture of heat resistance insulated wire - Google Patents
Manufacture of heat resistance insulated wireInfo
- Publication number
- JPH05182543A JPH05182543A JP3346290A JP34629091A JPH05182543A JP H05182543 A JPH05182543 A JP H05182543A JP 3346290 A JP3346290 A JP 3346290A JP 34629091 A JP34629091 A JP 34629091A JP H05182543 A JPH05182543 A JP H05182543A
- Authority
- JP
- Japan
- Prior art keywords
- tetrafluoroethylene
- insulated wire
- propylene copolymer
- heat resistance
- coating layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Organic Insulating Materials (AREA)
- Insulated Conductors (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は耐熱性絶縁電線の製造方
法に関し、更に詳しくは、電子レンジのヒータ用コード
や自動車内の配線用コードに用いて有効な耐熱性絶縁電
線を製造する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a heat-resistant insulated wire, and more particularly to a method for producing a heat-resistant insulated wire effective for use as a heater cord of a microwave oven or a wiring cord in an automobile. ..
【０００２】[0002]
【従来の技術】フッ素系ゴムは、耐熱性，電気絶縁性，
耐油性，耐薬品性，および難燃性が優れている材料なの
で、電子レンジなど耐熱性が要求される電子機器の配線
用の被覆材として、また、ヒータ用コードやセンサコー
ドの絶縁被覆材として、更には自動車内の配線用コード
の耐油被覆材として用いられている。2. Description of the Related Art Fluorine-based rubber has heat resistance, electrical insulation,
Since it is a material with excellent oil resistance, chemical resistance, and flame retardancy, it can be used as a covering material for wiring of electronic devices that require heat resistance such as microwave ovens, and as an insulating covering material for heater cords and sensor cords. Further, it is used as an oil resistant coating material for wiring cords in automobiles.
【０００３】各種のフッ素系ゴムのうち、テトラフルオ
ロエチレン−プロピレン共重合体は、他のフッ素系ゴム
エラストマに比べて安価であるため、上記した用途の外
に、電線やケーブルの絶縁被覆材料としても広く用いら
れている。Among various fluororubbers, tetrafluoroethylene-propylene copolymer is cheaper than other fluororubber elastomers, and therefore, as an insulating coating material for electric wires and cables, in addition to the above-mentioned applications. Is also widely used.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このテ
トラフルオロエチレン−プロピレン共重合体を導体周囲
に押出被覆して絶縁電線を製造すると、このテトラフル
オロエチレン−プロピレン共重合体は非常に軟質な材料
であるため、押出走線時に押出被覆装置のガイドロール
などで潰れたり、また製造された電線が相互に粘着して
互いの押出被覆層が損傷することがあり、電線使用時に
その部分が絶縁不良になってスパークなどが発生するこ
とがある。However, when this tetrafluoroethylene-propylene copolymer is extrusion-coated around the conductor to produce an insulated wire, the tetrafluoroethylene-propylene copolymer is a very soft material. As a result, the wires may be crushed by the guide rolls of the extrusion coating device during extrusion running, or the manufactured wires may stick to each other and damage each other's extrusion coating layer. And sparks may occur.
【０００５】また、テトラフルオロエチレン−プロピレ
ン共重合体は、他のフッ素系ゴムに比べて、引張強さ，
強靱性，耐摩耗性などの機械的特性が劣るという問題が
ある。このような問題の解決を目的として、例えば、特
開昭５９−１３９５０４号公報には、テトラフルオロエ
チレン−プロピレン共重合体にエチレン−テトラフルオ
ロエチレン共重合体を混練する方法が開示されている。Further, the tetrafluoroethylene-propylene copolymer has a tensile strength higher than that of other fluororubbers.
There is a problem that mechanical properties such as toughness and wear resistance are inferior. For the purpose of solving such a problem, for example, JP-A-59-139504 discloses a method of kneading a tetrafluoroethylene-propylene copolymer with an ethylene-tetrafluoroethylene copolymer.
【０００６】しかしながら、この方法の場合、配合する
エチレン−テトラフルオロエチレン共重合体の融点は約
２６０℃と高温であるため、両者の混練温度や成形温度
を３００℃付近にまで昇温することが必要となり、その
結果、成形作業性の低下のみならず、混練樹脂に焼けが
生じるなどの不都合な問題が生ずる。また、特開昭５９
−２３００３０号公報には、テトラフルオロエチレン−
プロピレン共重合体にポリフッ化ビニリデンを混練する
方法が開示されている。However, in this method, since the melting point of the ethylene-tetrafluoroethylene copolymer to be blended is as high as about 260 ° C., the kneading temperature of both and the molding temperature can be raised to around 300 ° C. As a result, not only the molding workability is deteriorated, but also inconvenient problems such as burning of the kneaded resin occur. In addition, JP-A-59
No. 230030 discloses tetrafluoroethylene-
A method of kneading polyvinylidene fluoride with a propylene copolymer is disclosed.
【０００７】この方法の場合、ポリフッ化ビニリデンの
融点は約２００℃と比較的低温であるため、前記特開昭
５９−１３９５０４号公報記載の方法に比べてその成形
加工性は優れている。しかしながら、ポリフッ化ビニリ
デンとテトラフルオロエチレン−プロピレン共重合体と
の相溶性は悪く、そのため、両者を混練して均一な組成
にすることは非常に困難であるという問題がある。In this method, since the melting point of polyvinylidene fluoride is about 200 ° C., which is a relatively low temperature, its moldability is superior to that of the method described in JP-A-59-139504. However, the compatibility between polyvinylidene fluoride and a tetrafluoroethylene-propylene copolymer is poor, and therefore it is very difficult to knead them to form a uniform composition.
【０００８】更に、特開昭６３−２８４７１２号公報に
は、テトラフルオロエチレン−プロピレン共重合体とエ
チレン−酢酸ビニル共重合体を混練する方法が提案され
ている。この方法は、混練を２００℃未満の温度で行な
うことができ、また両者の相溶性も良好であるという利
点を備えている。しかしながら、得られた混練物は、老
化特性や難燃性が良好とはいえず、また各種の機械的特
性が飛躍的に向上するというわけでもない。Further, Japanese Patent Laid-Open No. 63-284712 proposes a method of kneading a tetrafluoroethylene-propylene copolymer and an ethylene-vinyl acetate copolymer. This method has the advantage that the kneading can be carried out at a temperature of less than 200 ° C. and the compatibility of the two is good. However, the obtained kneaded product cannot be said to have good aging characteristics and flame retardancy, and it does not mean that various mechanical characteristics are dramatically improved.
【０００９】本発明は、テトラフルオロエチレン−プロ
ピレン共重合体を被覆層の材料にする場合における上記
した問題を解決し、機械的特性も向上した耐熱性絶縁電
線を安価に製造する方法の提供を目的とする。The present invention solves the above problems in the case of using a tetrafluoroethylene-propylene copolymer as a material for the coating layer, and provides a method for inexpensively producing a heat resistant insulated wire having improved mechanical properties. To aim.
【００１０】[0010]
【課題を解決するための手段】上記した目的を達成する
ために、本発明においては、テトラフルオロエチレン−
プロピレン共重合体１００重量部、密度0.９１g/cm3 以
下のポリエチレン５〜３０重量部を必須成分とするゴム
組成物の層を導体の周囲に形成し、ついで、前記ゴム組
成物を架橋することを特徴とする耐熱性絶縁電線の製造
方法が提供される。In order to achieve the above object, in the present invention, tetrafluoroethylene-
A layer of a rubber composition containing 100 parts by weight of a propylene copolymer and 5 to 30 parts by weight of polyethylene having a density of 0.91 g / cm 3 or less as an essential component is formed around a conductor, and then the rubber composition is crosslinked. A method for manufacturing a heat resistant insulated wire is provided.
【００１１】本発明においては、まず、テトラフルオロ
エチレン−プロピレン共重合体とポリエチレンが混練さ
れる。ポリエチレンとしては、密度が0.９１g/cm3 以下
の超低密度のポリエチレンが用いられる。この超低密度
ポリエチレンは、高圧法で製造されるエチレンとα−オ
レフィンとの共重合体で、とくにα−オレフィンとして
は、１−ブテンが用いられる。α−オレフィンと共重合
させることによって、分子中に短鎖分岐ができ、これが
結晶化を阻害するため、密度が低下し結晶化度も２０％
以下となる。In the present invention, first, the tetrafluoroethylene-propylene copolymer and polyethylene are kneaded. As polyethylene, ultra-low density polyethylene having a density of 0.91 g / cm 3 or less is used. This ultra-low density polyethylene is a copolymer of ethylene and α-olefin produced by a high pressure method, and 1-butene is particularly used as α-olefin. By copolymerizing with α-olefin, a short chain branch is formed in the molecule, which hinders crystallization, resulting in lower density and 20% crystallinity.
It becomes the following.
【００１２】このポリエチレンは、テトラフルオロエチ
レン−プロピレン共重合体との相溶性が良好で、しかも
２００℃未満の低温でテトラフルオロエチレン−プロピ
レン共重合体との均一混練が可能であるからである。更
に得られた混練物で導体を被覆したとき、その電線が相
互に粘着することや被覆層が圧潰することもなく、ま
た、その被覆層の引張強度などの機械的強度の大幅な向
上が認められ、更には、老化特性や難燃性の低下も起こ
らない。This polyethylene has good compatibility with the tetrafluoroethylene-propylene copolymer and can be uniformly kneaded with the tetrafluoroethylene-propylene copolymer at a low temperature of less than 200 ° C. Furthermore, when a conductor is coated with the obtained kneaded product, the electric wires do not stick to each other and the coating layer does not collapse, and a significant improvement in mechanical strength such as tensile strength of the coating layer is recognized. In addition, deterioration of aging characteristics and flame retardancy does not occur.
【００１３】ポリエチレンの配合量は、テトラフルオロ
エチレン−プロピレン共重合体１００重量部に対し、５
〜３０重量部に設定される。ポリエチレンの配合量が５
重量部未満の場合は、上記したポリエチレン配合による
効果がほとんど発揮されない。また、３０重量部を超え
ると、得られた混練物の老化特性が著しく低下してしま
う。ポリエチレンの好ましい配合量は、テトラフルオロ
エチレン−プロピレン共重合体１００重量部に対し、１
０〜２０重量部である。The blending amount of polyethylene is 5 parts with respect to 100 parts by weight of the tetrafluoroethylene-propylene copolymer.
It is set to 30 parts by weight. The amount of polyethylene is 5
When the amount is less than the weight part, the above-mentioned effects due to the blending of polyethylene are hardly exhibited. On the other hand, if it exceeds 30 parts by weight, the aging characteristics of the obtained kneaded product will be significantly deteriorated. The preferable blending amount of polyethylene is 1 part by weight with respect to 100 parts by weight of tetrafluoroethylene-propylene copolymer.
It is 0 to 20 parts by weight.
【００１４】なお、上記したゴム組成物の調製に際して
は、更に、架橋助剤やその他適宜な添加剤が配合されて
もよい。架橋助剤としては、例えば、アリル化合物類，
メタクリレート類，有機アミン類などをあげることがで
きるが、これらのうち、トリアリルシアヌレート，トリ
アリルイソシアヌレートのようなアリル化合物は好適で
ある。また、他の添加剤としては、例えば、炭酸カルシ
ウム，炭酸バリウム，乾式シリカ，湿気シリカ，酸化亜
鉛，ケイ酸アルミニウム，硫酸カルシウム，硫酸バリウ
ム，タルク，ケイソウ土のような公知の無機充填剤やシ
リコーンなどの外観改良剤，その他の有機質または無機
質の顔料や、安定剤，老化防止剤などをあげることがで
きる。When preparing the above-mentioned rubber composition, a crosslinking aid and other appropriate additives may be further added. Examples of the cross-linking aid include allyl compounds,
Methacrylates, organic amines and the like can be mentioned, and of these, allyl compounds such as triallyl cyanurate and triallyl isocyanurate are preferable. Other additives include, for example, known inorganic fillers such as calcium carbonate, barium carbonate, dry silica, moist silica, zinc oxide, aluminum silicate, calcium sulfate, barium sulfate, talc and diatomaceous earth, and silicone. And other appearance improving agents, other organic or inorganic pigments, stabilizers, antiaging agents and the like.
【００１５】混練は、バンバリーミキサー，ニーダー，
ゴム混練り用ロール等の混練機を用い、１７０℃以上の
温度で１０分以上の時間をかけて行なえばよい。このよ
うにして調整されたゴム組成物は、押出成形機を用いて
導体の周囲に押出被覆される。このときの押出成形機の
温度は、シリンダー内で約２００℃、クロスヘッドで約
２１０℃程度であることが好ましい。The kneading is performed with a Banbury mixer, a kneader,
A kneading machine such as a rubber kneading roll may be used at a temperature of 170 ° C. or higher for 10 minutes or longer. The rubber composition thus prepared is extrusion-coated around the conductor by using an extruder. At this time, the temperature of the extruder is preferably about 200 ° C. in the cylinder and about 210 ° C. in the crosshead.
【００１６】最後に、得られた電線の被覆層に電子線照
射を行ない、その被覆層を構成するゴム組成物を架橋し
て、本発明の絶縁電線が製造される。このときの電子線
の照射量は格別限定されるものではないが、通常、２〜
６０Mradであればよい。Finally, the coating layer of the obtained electric wire is irradiated with an electron beam and the rubber composition constituting the coating layer is crosslinked to produce the insulated electric wire of the present invention. The irradiation dose of the electron beam at this time is not particularly limited, but usually 2 to
It should be 60 Mrad.
【００１７】[0017]
実施例１〜３、比較例１〜５ 表１に示した各成分を表示の割合（重量部）で、ニーダ
ー，ゴム混練り用ロールを用いて順次混練し、得られた
混練物を、導体径0.９mmの裸導線に厚み0.３５mmで押出
被覆した。ついで、被覆層に１５Mradの照射量で電子線
を照射して混練物を架橋し、絶縁電線を製造した。Examples 1 to 3 and Comparative Examples 1 to 5 The components shown in Table 1 were sequentially kneaded in the indicated proportions (parts by weight) using a kneader and a rubber kneading roll, and the resulting kneaded product was used as a conductor. A bare conductor having a diameter of 0.9 mm was extrusion-coated with a thickness of 0.35 mm. Then, the kneaded material was crosslinked by irradiating the coating layer with an electron beam at an irradiation dose of 15 Mrad to produce an insulated wire.
【００１８】各電線につき、被覆層の引張試験による抗
張力(kgf/mm2) 、伸び率（％）を測定した。また、各電
線を温度２３８℃で７日間放置し、そのときの被覆層の
抗張力と伸び率も測定し熱処理前の値に対する割合（残
率：％）を算出した。更に、各混練物については、ＪＩ
ＳＫ７２１５に準拠して厚み９mmのシートにおけるデュ
ロメータ硬さを測定した。また、各電線の被覆層の外傷
の有無を観察し、被覆層の粘着性を調べた。以上の結果
を一括して表１に示した。For each electric wire, the tensile strength (kgf / mm 2 ) and elongation rate (%) of the coating layer were measured by a tensile test. Further, each electric wire was allowed to stand at a temperature of 238 ° C. for 7 days, and the tensile strength and elongation of the coating layer at that time were also measured to calculate the ratio (residual ratio:%) to the value before heat treatment. Furthermore, regarding each kneaded product, JI
The durometer hardness of a sheet having a thickness of 9 mm was measured according to SK7215. Further, the presence or absence of external damage on the coating layer of each electric wire was observed to examine the adhesiveness of the coating layer. The above results are collectively shown in Table 1.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【発明の効果】以上の説明で明らかなように、本発明方
法によれば、導体の周囲の被覆層は、絶縁性はもとより
のこと、耐熱性，老化特性，機械的特性が優れている。
そして、押出被覆の過程で、被覆層相互の粘着も起こら
ないので外傷の発生はほとんどなく、絶縁不良に基づく
スパーク発生の虞れもない。また、押出被覆は２００℃
程度の低温で行なうことができて安価で加工性に優れた
絶縁電線を製造することができる。これは、テトラフル
オロエチレン−プロピレン共重合体に密度0.９１g/cm3
以下のポリエチレンを混練したことがもたらす効果であ
る。電子レンジヒータ用コードや自動車内配線コードの
製造にとって非常に有用である。As is apparent from the above description, according to the method of the present invention, the coating layer around the conductor is excellent in heat resistance, aging characteristics, and mechanical characteristics as well as in insulation.
Further, in the process of extrusion coating, since the coating layers do not adhere to each other, there is almost no occurrence of external damage, and there is no fear of sparking due to defective insulation. Also, extrusion coating is 200 ° C
It is possible to manufacture an insulated wire that can be performed at a low temperature of about 100%, is inexpensive, and has excellent workability. This is a tetrafluoroethylene-propylene copolymer having a density of 0.91 g / cm 3
This is an effect brought about by kneading the following polyethylene. It is very useful for manufacturing cords for microwave heaters and wiring cords for automobiles.
Claims (1)
重合体１００重量部、密度0.９１g/cm3 以下のポリエチ
レン５〜３０重量部を必須成分とするゴム組成物の層を
導体の周囲に形成し、ついで、前記ゴム組成物を架橋す
ることを特徴とする耐熱性絶縁電線の製造方法。1. A layer of a rubber composition containing 100 parts by weight of a tetrafluoroethylene-propylene copolymer and 5 to 30 parts by weight of polyethylene having a density of 0.91 g / cm 3 or less as an essential component is formed around a conductor, Then, a method for producing a heat-resistant insulated wire, which comprises cross-linking the rubber composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3346290A JPH05182543A (en) | 1991-12-27 | 1991-12-27 | Manufacture of heat resistance insulated wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3346290A JPH05182543A (en) | 1991-12-27 | 1991-12-27 | Manufacture of heat resistance insulated wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05182543A true JPH05182543A (en) | 1993-07-23 |
Family
ID=18382400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3346290A Pending JPH05182543A (en) | 1991-12-27 | 1991-12-27 | Manufacture of heat resistance insulated wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05182543A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015003985A (en) * | 2013-06-20 | 2015-01-08 | 日立金属株式会社 | Fluorine-containing elastomer composition, and insulated electric wire and insulated cable each using the same |
| US9701837B2 (en) | 2013-06-19 | 2017-07-11 | Autonetworks Technologies, Ltd. | Resin composition for wire covering material, insulated wire, and wiring harness |
-
1991
- 1991-12-27 JP JP3346290A patent/JPH05182543A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9701837B2 (en) | 2013-06-19 | 2017-07-11 | Autonetworks Technologies, Ltd. | Resin composition for wire covering material, insulated wire, and wiring harness |
| JP2015003985A (en) * | 2013-06-20 | 2015-01-08 | 日立金属株式会社 | Fluorine-containing elastomer composition, and insulated electric wire and insulated cable each using the same |
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